My 20*40 In Ground liner pool is about 3 years old and I noticed two corners are pulling out of the track. (Bead Liner) It has been very hot in Michigan the last week so I figured it would be a no brainer to put the liner back in. I can get the bead back in the corners but it just keeps coming back out. Is there a trick ? The concrete has tight radius corners but the liner track uses two 45 degree angles in the corner.